Ethiopian Species of Ischnurinse. 315 



weak ; (lower surface of tail strongly crested, 

 vesicle smooth). 

 c 1 . Anterior upper crest of humerus absent; keels 

 on last abdominal sternite and those on lower 

 surface of first caudal segment fiuely granular. Jonesii (Poc). 

 b 1 . Crest on humerus distinct ; keels on lower sur- 

 face of first caudal segment and on last abdo- 

 minal sternite smooth crassimanus, sp. n. 



b. Hand flatter, narrower, width less than length of 



hand-back ; more of the carapace showing below 



the lateral eyes ; crest on humerus very strong. 



a 2 . Lower side of tad much less strongly crested ; 



its upper surface with shallower median groove. 



a 3 . Carapace deeply excised in front ; abdomen 



and tail not thickly punctured ; vesicle 



smooth ; pectinal teeth 9-13 Lecontei (Luc). 



b 3 . Carapace less deeply excised ; abdomen and 

 tail thickly punctured; vesicle granular 



below ; pectinal teeth 5-7 africanus, Sim. 



b 2 . Lower side of tail strongly keeled ; groove on 

 its upper surface deeper. 

 « 4 . Hand coarsely granular above ; a bristle on 



the inferior distal angle of the tarsi rugulosus, sp. n. 



6 4 . Hand not granular above ; a spine on the 

 inferior distal angle of the tarsi. 

 a 5 . Femora externally finely punctured, not 

 granular ; hand less coarsely sculptured ; 



pectinal teeth 8-10 asper (Pet.). 



b 5 . Femora externally granular ; upperside of 

 hand with a coarsely reticulated pattern ; 

 pectinal teeth 5-7 ralidus, Thor. 



Opisthacanthus punctulatus, sp. n. 



Colour a uniform dull brown ; legs the same tint as the 

 trunk, and not brownish red as in most species of the genus. 



Carapace densely punctured, anteriorly finely granular ; 

 the median lateral eye a little nearer the posterior than the 

 anterior of the series. 



Terga finely and closely punctured ; sterna smooth, 

 polished, finely punctured. 



Tail as in 0. madagascariensis, Kraepelin. 



Chelce long and slender, densely punctured ; humerus and 

 brachium very finely granular above, humerus with just a 

 few minute granules below at the base ; humerus furnished 

 with a very large internal basal process ; hand not granular 

 above, except towards the inner edge ; inner surface armed 

 with two crests of strong granules ; flat and depressed, the 

 two areas of the upper surface meeting at right angles ; width 

 of the hand about two thirds the length of the hand-back, 

 which exceeds that of the movable digit. 



Legs with femora finely granular externally ; tarsal spine- 



